mATX is backwards compatible with ATX.
mATX will fit in any ATX case.. its designed that way.
EDIT: 1st case even states that, you missed it:
With its innovative styling and high quality construction, the Cooler Master Centurion 5 CAC-T05-WW case lends a hot, edgy look to your system. Measuring in at 120mm and 80mm respectively, the front and back fans on this case will make quick work of noxious dust and heat that can potentially wreak havoc on your PC.
This stunning case, compatible with all ATX and Micro ATX motherboards,